Rainbow Electronics MAX1712 - Manual (Page 4)

MAX1710/MAX1711/MAX1712
High-Speed, Digitally Adjusted
Step-Down Controllers for Notebook CPUs
4 _______________________________________________________________________________________
% 10 15
V BATT = 4.5V to 28V, for all
D/A codes, includes load
regulation error
V CC, V DD
Battery voltage, V+
Measured at V CC , FB forced above the regulation point
Overvoltage Trip Threshold
(Note 2)
V BATT = 24V,
FB = 2V
(Note 2)
With respect to unloaded output voltage (MAX1710) %
CONDITIONS
65 75 Output Undervoltage
Protection Threshold
µA 950 Quiescent Supply Current (V CC )
ns 500 Minimum Off-Time
380 470
260 320
175 225
% -1.5 1.5
DC Output Voltage Accuracy
TON = REF (400kHz)
4.5 5.5
V
2 28
Input Voltage Range
TON = GND (550kHz)
ns
140 180
On-Time
TON = open (300kHz)
UNIT MIN TYP MAX PARAMETER
V
CC
= 4.5V to 5.5V, no external REF load V 1.98 2.02 Reference Voltage
TON = V
CC
(200kHz)
LX to PGND, ILIM tied to V CC mV 85 115
Current-Limit Threshold
(Positive Direction, Fixed)
LX to PGND mV
35 65 Current-Limit Threshold
(Positive Direction, Adjustable) R LIM = 100k Ω
R LIM = 400k Ω 160 240
Rising edge, hysteresis = 20mV, PWM disabled below
this level
4.1 4.4
V CC Undervoltage Lockout
Threshold
V
D0–D4, SHDN, SKIP, OVP V 2.4 Logic Input High Voltage
D0–D4, SHDN, SKIP, OVP V 0.8 Logic Input Low Voltage
SHDN, SKIP, OVP µA -1 1 Logic Input Current
D0–D4, each forced to GND µA 3 10 Logic Input Pullup Current
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
BATT
= 15V, V
CC
= V
DD
= 5V, SKIP = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 3)
V 2.20 2.30
0.75 0.85 V
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V BATT = 15V, V CC = V DD = 5V, SKIP = GND, T A = 0°C to +85°C, unless otherwise noted.)
CONDITIONS
TON logic input high level V V
CC
- 0.4 TON V
CC
Level
TON logic input upper-midrange level V 3.15 3.85 TON Float Voltage
TON logic input lower-midrange level V 1.65 2.35 TON Reference Level
TON logic input low level V 0.5 TON GND Level
TON only, forced to GND or V CC µA -3 3 TON Logic Input Current
UNIT MIN TYP MAX PARAMETER
With respect to unloaded output voltage (MAX1710)
(MAX1711/MAX1712)
(MAX1711/MAX1712)
% -1.7 1.7
DAC codes from 1.32V to 2V
DAC codes from 0.925V to
1.275V